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L juring = 77 cm²
r = 14 cm
Ditanyakan ⇒ α?
Penyelesaian ↓
L lingkaran = π × r²
= 22/7 × 14²
= 22/7 × 196
= 22 × 28
= 616 cm²
L juring = α/360 × L lingkaran
77 = α/360 × 616
77 × 360 = α × 616
27.720 = 616α
45 = α
Jadi besar sudut POQ adalah 45°